Knowledge on Synthetics and Imitations of Tanzanite

February 13, 2019 0

By Eng.Gilay Shamika Engineer & Gemologist – TMAA Email: gshamika@tmaa.go.tz Tanzania Minerals Audit Agency has accredited laboratory with ISO 17025/IEC. The Laboratory core activity is to analyse samples from Large Scale, Medium and Small Scale […]

What is Emerald Gemstone?

February 13, 2019 0

                  Picture 1: Rough Sapphire                      Emerald name comes from Greek word meaning green. Before, Greeks called all gemstones with green color Emeralds until when gemological knowledge categorized other green colored gemstones according to their refractive […]